CHICAGO (CBS) — Is there a secret plan to evacuate some residents of Chicago in the event of major trouble during the NATO summit next month? CBS 2 has uncovered some evidence that there is. It comes from the Milwaukee area branch of the American Red Cross.

CBS 2 News has obtained a copy of a Red Cross e-mail sent to volunteers in the Milwaukee area.

It said the NATO summit “may create unrest or another national security incident. The American Red Cross in southeastern Wisconsin has been asked to place a number of shelters on standby in the event of evacuation of Chicago.”

According to a chapter spokesperson, the evacuation plan is not theirs alone.

“Our direction has come from the City of Chicago and the Secret Service,” she said.